itunes stutter on full screen

i continue to have intermittent problems with audio stutter while attempting to watch a movie or videos on full screen....regular size sounds fine, when full screen is accessed, then the audio stutter begins....when going back to regular screen the audio clears up and plays as it is supposed to.... i am running an early 2008 mac pro with osx maverick running 2 screens and 32 gb ram.... note: when playing youtube on fullscreen, the audio stutter is not present...only from itunes... any suggestions? thanks!